How to increase the speed of the Internet on Xiaomi Redmi Note 9 Pro: from settings to hardware

Xiaomi Redmi Note 9 Pro is one of the most popular mid-range smartphones, but even it is not immune to the problems with slow Internet. Did you notice that pages load for eternity, YouTube videos are constantly “buffering” and online games are lagging?

In this article, we'll look at 10 proven ways to increase mobile internet speed (4G/LTE) and Wi-Fi on the Redmi Note 9 Pro, from basic settings to deep tweaks. Importantly, some methods require superuser rights, but most are available without them. Let's start with the simplest and gradually move on to advanced techniques.

1. Current speed check: Basic test

Before you can optimize something, you have to understand how bad the situation is.

• 📱 Install Speedtest by Ookla (available on Google Play) or nPerf – they will show the real speed of download / return.
• 📡 Run a Wi-Fi and mobile internet test separately to compare results.
• 📊 Pay attention to ping: if it’s above 100ms, it’s critical for gaming and video calls.

Normal performance for Redmi Note 9 Pro (with Qualcomm Snapdragon 720G chipset):

If your numbers are significantly lower, move on to the next section, and if the speed is normal but subjectively slowing down, the problem could be DNS or background traffic (more on that later).

2. Optimization of mobile Internet settings (4G/LTE)

Often, mobile Internet slowdowns are due to the wrong APN settings or network mode.

1. Check it out. APN: Go to Settings. → SIM-maps and mobile networks → [yours SIM] → Access points (APN). Make sure your operator profile is active, if not, create it manually (options can be found on the operator's website).
2. Turn on 4G+ (LTE Advanced): in the same settings, select Network Type → 4G (recommended). If you have an LTE/4G/3G/2G (auto), try it - sometimes the smartphone sticks to 3G.
3. Turn it off. VoLTE/VoWiFi (if you don't use it: these features may conflict with data. → SIM-map → [yours SIM] → Challenges through LTE/VoWiFi.

Critical setting for the Redmi Note 9 Pro: in the menu ##4636## (engineering menu) go to Phone Information and select Set preferred network type → LTE only. This will make the smartphone always use 4G, ignoring 3G/2G. Be careful: in roaming this can lead to no connection!

Verification APN|Inclusion LTE Advanced|Shutdown VoLTE/VoWiFi|Choice of regime "LTE "only" in the engineering menu-->

⚠️ Warning: If the Internet is completely lost after the change of mode, restart the smartphone or return the settings to the Auto, Tele2) Can block manual network selection.

3. Wi-Fi Acceleration: Channel Choice, Standard and Protocols

Wi-Fi on the Redmi Note 9 Pro supports 802.11 a/b/g/n/ac (up to Wi-Fi 5), but speed depends on the router settings.

• 📶 Change Wi-Fi: In router settings (usually 192.168.0.1 or 192.168.1.1), select the channel with the minimum load. 1, 6, 11 (not crossed), for 5 GHz - any free channel will do.
• 🔄 Turn on the mode. 802.11ac: In the router settings, find “Wireless Mode” and select 802.11ac (or a/n/ac). This will speed up the connection to 866 Mbps 5 GHz.
• 🔒 Turn off encryption. WKR: if the router supports WPA3, Use it. If you don't, leave it. WPA2-PSK (AES). TKIP and WEP slow down.
• 📡 Activate. MU-MIMO: If your router supports this technology, turn it on – it allows you to share data with multiple devices simultaneously.

On the Redmi Note 9 Pro itself, you can turn on the Smart Wi-Fi Switch option (Settings → Wi-Fi → Additional → Smart Switch), but it sometimes malfunctions. You better turn it off and manually choose between 2.4 GHz (range) and 5 GHz (speed).

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If Wi-Fi speed drops when you’re away from the router, try reducing the channel width in your router settings from 80 MHz to 40 MHz (for 5 GHz), which will lower the top speed but increase stability.

4. Reset network settings and cache

Over time, DNS errors, network cache and conflicting settings accumulate in the system to reset them:

1. Go to Settings → System and Device → Settings Reset → Network Reset. This will remove all stored Wi-Fi, Bluetooth and VPN.
2. Clear the cache of Google Play Services and Google Play Services (Settings → Apps → All Apps → [select] → Storage → Clear the cache).
3. If you use a VPN, turn it off and check the speed without it. Some VPNs (like free ones) artificially restrict traffic.

After reset, reboot your smartphone and reconnect to the Wi-Fi/mobile network. If the problem was an IP or DNS conflict, the speed should increase.

⚠️ Warning: Resetting your network settings will delete all saved Wi-Fi passwords, including hidden networks.

5.DNS Optimization: Why It Matters

Domain name system (DNS) Converts the addresses of sites (such as google.com) to IP-addresses, if DNS-The server of the operator or provider is slow, and there will be delays even when the Internet is fast. DNS:

• 🌍 Google DNS: 8.8.8.8 and 8.8.4.4
• 🌍 Cloudflare DNS: 1.1.1.1 and 1.0.0.1 (fastest for mobile devices)
• 🌍 Yandex DNS: 77.88.8.8 and 77.88.8.1 (optimized for Russia)

To change the DNS to Redmi Note 9 Pro:

1. For Wi-Fi: Hold your finger on the connected network → Change the network → More → IP settings → Select Static and write DNS.
2. For mobile internet, you will need an application like DNS Changer (without root) or edit /system/etc/resolv.conf (with root).

Check the difference in speed before and after a DNS change with Speedtest. Cloudflare often gives a gain of 10-30% due to less ping.

6.Limit background traffic and "gluttonous" apps

Many apps (especially social media, instant messengers, and games) consume traffic in the background even when you're not using them, and this not only consumes gigabytes, but also steals speed from active tasks.

• 📵 Limit background traffic: Settings → Annexes → [select] → Mobile data and Wi-Fi → Background traffic → Limit.
• 🚫 Turn off autoboot: in the same settings of the application, find “Outload” and turn it off.
• 🔄 Use "Data Mode": in Settings → SIM-maps and mobile networks → Select Data Mode to Save Traffic.
• 📊 Check traffic statistics: Settings → SIM-maps and mobile networks → Traffic usage. Sort by "Background traffic" and block the most active traffic.

Pay particular attention to:

• Facebook and Instagram are constantly syncing data.
• Google Play Services – can download updates in the background.
• Torrent clients (e.g. uTorrent) – even in passive mode, consume traffic.

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Background traffic can eat up to 30% of internet speed, and disabling auto updates and restricting social media often generates more gains than changing DNS or APN.

7. Advanced methods: USB debugging and engineering menu

If the basic methods don't work, it's time to dig deeper, and these methods require technical training, but they can give you a significant increase in speed.

🔧 Engineering menu (##4636##)

This menu can be used:

• View the current network standard (LTE CA is 4G+).
• Enable LTE only (as mentioned earlier).
• Signal Strength: If it's below -100 dBm, the problem is the carrier's coverage.

🖥️ Debugging by USB and ADB-team

With the help of ADB (Android Debug Bridge) you can:

1. Reset the network statistics: adb shell netstats reset
2. Insert carrier aggregation (LTE CA), If it is disabled: adb shell settings put global preferred_network_mode 9 (where 9 — regime LTE/4G).
3. View the current modem settings: adb shell getprop gsm.operator.*

Working with ADB will require:

1. Enable USB Debugging (Settings → About Phone → MIUI version – tap 7 times, then return to Additional → For Developers → Debugging by USB).
2. Install Platform Tools on PC (download from Google website).
3. Connect your smartphone to your PC and execute commands in Command Prompt or Terminal.

⚠️ Attention: Wrong ADB-commands can disrupt the modem. Don't change settings unless you're sure what they mean. captive_portal_detection_enabled 0 disables the check of the Internet connection, which can lead to traffic leaks.

8. Hardware causes: antenna, SIM-map

If the software methods did not help, the problem may be in the hardware:

• 📶 Redmi Note 9 Pro has two antennas for the MIMO (for 4G+), But if one of them is damaged, the speed drops, and see if the metal frame bends near the connector. SIM-map.
• 🔧 Faulty. SIM-map: try inserting SIM If the speed is normal, the problem is in the Redmi slot. SIM-scatter-card.
• 🔥 Overheating: Snapdragon chipset 720G heat-up°C begins to trottle (limit) performance, including internet speed. Check the temperature in the app AIDA64.
• 🔋 Weak battery: at a charge level below 15%, the smartphone can artificially limit power consumption, which affects speed LTE.

If you suspect a hardware malfunction:

1. Check the speed of the Internet in a deserted place (for example, outside the city) – if there it is normal, the problem is the congestion of the operator’s network.
2. Put it in. SIM-slot-card SIM 1 – It usually has the best antenna.
3. If the smartphone fell or got wet, contact the service - perhaps the antenna plume has gone.

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Hardware problems often manifest themselves as floating symptoms: the speed is normal, then disappears. If after a smartphone reboot, the Internet temporarily speeds up, this is a sign of a software failure. If not, look for the problem in the hardware.

FAQ: Frequent questions about Internet speed on Redmi Note 9 Pro